A flexible JSON object linter with out of the box support for OpenAPI v2 and v3
- Create custom rules to lint any JSON object
- Use JSON paths to apply rules / functions to specific parts of your JSON objects
- Built-in set of functions to help build custom rules. Functions include pattern checks, parameter checks, alphabetical ordering, a specified number of characters, provided keys are present in an object, etc
- Create custom functions for advanced use cases
- Optional ready to use rules and functions to validate and lint OpenAPI v2 and v3 documents
- Validate JSON with Ajv
npm install @stoplight/spectral
npm install -g @stoplight/spectral
Supports Node v8.3+ and modern browsers.
For users without Node and/or NPM/Yarn, we provide standalone packages for all major platforms. We also provide a shell script to auto download the executable based on your operating system:
curl -L https://raw.githack.com/stoplightio/spectral/master/install.sh | sh
Note, the binaries are not auto-updatable, therefore you will need to download a new version on your own.
sudo mv ./spectral-linux /usr/local/bin/spectral
You may need to restart your terminal.
Now, spectral
command will be accessible in your terminal.
Head over to releases for the latest binaries.
docker run --rm -it stoplight/spectral lint "${URL}"
Spectral can be run via the command-line:
spectral lint petstore.yaml
Other options include:
-e, --encoding=encoding text encoding to use
-f, --format=json|stylish formatter to use for outputting results
-h, --help show CLI help
-o, --output=output output to a file instead of stdout
-q, --quiet no logging - output only
-r, --ruleset=ruleset path to a ruleset file (supports remote files)
-s, --skip-rule=skip-rule ignore certain rules if they are causing trouble
-v, --verbose increase verbosity
Note: The Spectral CLI supports both YAML and JSON.
Currently, Spectral CLI CLI supports validation of OpenAPI documents and lints them based on our default ruleset, or you can provide your own rulesets.
There are three key concepts in Spectral: Rulesets, Rules and Functions.
- Ruleset is a container for a collection of rules and functions.
- Rule filters your object down to a set of target values, and specify the function that should evaluate those values.
- Function accept a value and return issue(s) if the value is incorrect.
Think of a set of rules and functions as a flexible and customizable style guide for your JSON objects.
Spectral is written in TypeScript (JavaScript) and can be used directly for when you need to use Spectral programmatically. Take a look at our "JavaScript API documentation".
How is this different than Ajv?
Ajv is a JSON Schema validator, not a linter. Spectral does expose a schema
function that you can use in your rules to validate all or part of the target object with JSON Schema (Ajv is used under the hood). However, Spectral also provides a number of other functions and utilities that you can use to build up a linting ruleset to validates things that JSON Schema is not well suited for.
I want to lint my OpenAPI documents but don't want to implement Spectral right now.
No problem! A hosted version of Spectral comes free with the Stoplight platform. Sign up for a free account here.
What is the difference between Spectral and Speccy?
With Spectral, lint rules can be applied to any JSON object. Speccy is designed to work with OpenAPI v3 only. The rule structure is different between the two. Spectral uses JSONPath path
parameters instead of the object
parameters (which are OpenAPI specific). Rules are also more clearly defined (thanks to TypeScript typings) and now require specifying a type
parameter. Some rule types have been enhanced to be a little more flexible along with being able to create your own rules based on the built-in and custom functions.
If you are interested in contributing to Spectral itself, check out our contributing docs to get started.
Also, most of the interesting projects are built with Spectral. Please consider using Spectral in a project or contribute to an existing one.
If you are using Spectral in your project and want to be listed in the examples section, we encourage you to open an issue.
- Stoplight's Custom Style and Validation Rules uses Spectral to validate and lint OpenAPI documents on the Stoplight platform
- Spectral GitHub Bot, a GitHub pull request bot that lints your repo's OpenAPI document that uses the Probot framework, built by Taylor Barnett
- Spectral GitHub Action, a GitHub Action that lints your repo's OpenAPI document, built by Vincenzo Chianese
- JSONPath Online Evaluator, a helpful tool to determine what
path
you want - stoplightio/json, a library of useful functions for when working with JSON
- stoplightio/yaml, a library of useful functions for when working with YAML, including parsing YAML into JSON, and a few helper functions such as
getJsonPathForPosition
orgetLocationForJsonPath
- Phil Sturgeon for collaboration and creating Speccy
- Mike Ralphson for kicking off the Spectral CLI
If you have a bug or feature request, please open an issue here.
If you need help using Spectral or have a support question, please use the Stoplight Community forum. We've created an open source category for these questions. It's also a great place to share your implementations.
If you want to discuss something in private, you can reach out to Stoplight support at support@stoplight.io.